We report the magneto-optical observation of a surprising fourfold symmetry of the flux penetration in a superconducting YBa₂Cu₃O_7-δ thin-film disk containing a square array of antidots, leading to an angular variation of the critical current by a factor of nearly 2. This behavior is explained using a vortex channeling model. Potential applications in superconducting devices are discussed
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Pannetier-Lecœur et al. (2003) studied this question.
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